User equipment overheating handling during lte-new radio simultaneous ul transmission

ABSTRACT

The present disclosure pertains to a user equipment for a mobile telecommunications system, which has a circuitry configured to communicate with a new radio base station and a LTE base station. The circuitry is further configured to: perform simultaneous uplink communication with the LTE base station and the new radio base station; detect an overheating situation; and transmit capability information in response to detecting the overheating situation.

TECHNICAL FIELD

The present disclosure generally pertains to base stations and userequipments for a mobile telecommunications system.

TECHNICAL BACKGROUND

Several generations of mobile telecommunications systems are known, e.g.the third generation (“3G”), which is based on the International MobileTelecommunications-2000 (IMT-2000) specifications, the fourth generation(“4G”), which provides capabilities as defined in the InternationalMobile Telecommunications-Advanced Standard (IMT-Advanced Standard), andthe current fifth generation (“5G”), which is under development andwhich might be put into practice in the year 2020.

A candidate for providing the requirements of 5G is the so-called LongTerm Evolution (“LTE”), which is a wireless communications technologyallowing high-speed data communications for mobile phones and dataterminals and which is already used for 4G mobile telecommunicationssystems. Other candidates for meeting the 5G requirements are termed NewRadio (NR) Access Technology Systems (NR). An NR can be based on LTEtechnology, just as LTE was based on previous generations of mobilecommunications technology.

LTE is based on the GSM/EDGE (“Global System for MobileCommunications”/“Enhanced Data rates for GSM Evolution” also calledEGPRS) of the second generation (“2G”) and UMTS/HSPA (“Universal MobileTelecommunications System”/“High Speed Packet Access”) of the thirdgeneration (“3G”) network technologies.

LTE is standardized under the control of 3GPP (“3rd GenerationPartnership Project”) and there exists a successor LTE-A (LTE Advanced)allowing higher data rates than the basic LTE and which is alsostandardized under the control of 3GPP.

For the future, 3GPP plans to further develop LTE-A such that it will beable to fulfill the technical requirements of 5G.

As the 5G system will be based on LTE or LTE-A, respectively, it isassumed that specific requirements of the 5G technologies will,basically, be dealt with by features and methods which are alreadydefined in the LTE and LTE-A standard documentation.

As discussed, in 3GPP a work Item (WI) on New Radio Access Technology(NR) has been agreed. The new Radio Access Technology (RAT) is expectedto operate in a large range of frequencies, from hundreds of MHz to 100GHz and it is expected to cover a broad range of use cases. Use cases,which are considered, are, for example:

-   -   Enhanced Mobile Broadband (eMBB)    -   Massive Machine Type Communications (mMTC)    -   Ultra Reliable & Low Latency Communications (URLLC)

At least for initial deployment, NR and LTE are expected to coexist.

Although there exist signaling techniques for LTE, it is generallydesirable to improve coexisting situations between NR and LTE.

SUMMARY

According to a first aspect, the disclosure provides a user equipmentfor a mobile telecommunications system including circuitry configured tocommunicate with a new radio base station and a LTE base station,wherein the circuitry is further configured to perform simultaneousuplink communication with the LTE base station and the new radio basestation; detect an overheating situation; and transmit capabilityinformation in response to detecting the overheating situation.

According to a second aspect, the disclosure provides a base station fora mobile telecommunications system including circuitry configured tocommunicate with at least one user equipment, wherein the circuitry isfurther configured to: receive capability information from the eat leastone user equipment, wherein the capability information is transmitted bythe user equipment based on a detected overheating situation.

Further aspects are set forth in the dependent claims, the followingdescription and the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments are explained by way of example with respect to theaccompanying drawings, in which:

FIG. 1 illustrates a radio access network including LTE and NR basestations;

FIG. 2 illustrates the coexistence of NR and LTE subframe transmission;

FIG. 3 illustrates the coexistence of NR and LTE transmission in thefrequency domain;

FIG. 4 illustrates a method for mobile telecommunications according toan embodiment;

FIG. 5 illustrates an embodiment for signaling of assistanceinformation; and

FIG. 6 illustrates a general purpose computer which is able to implementthe base stations and user equipments as described herein.

DETAILED DESCRIPTION OF EMBODIMENTS

Before a detailed description of the embodiments under reference of FIG.1 is given, general explanations are made.

As mentioned in the outset, several generations of mobiletelecommunications systems are known, e.g. the third generation (“3G”),the fourth generation (“4G”), which provides capabilities as defined inthe International Mobile Telecommunications-Advanced Standard(IMT-Advanced Standard), and the current fifth generation (“5G”), whichis under development and which might be put into practice in the year2020.

As discussed, a candidate for providing the requirements of 5G is theso-called Long Term Evolution (“LTE”), which is a wirelesscommunications technology allowing high-speed data communications formobile phones and data terminals and which is already used for 4G mobiletelecommunications systems. Other candidates for meeting the 5Grequirements are termed New Radio (NR) Access Technology Systems (NR).An NR can be based on LTE technology, just as LTE was based on previousgenerations of mobile communications technology.

As mentioned, LTE is based on the GSM/EDGE (“Global System for MobileCommunications”/“Enhanced Data rates for GSM Evolution” also calledEGPRS) of the second generation (“2G”) and UMTS/HSPA (“Universal MobileTelecommunications System”/“High Speed Packet Access”) of the thirdgeneration (“3G”) network technologies, and there exists the successorLTE-A (LTE Advanced) allowing higher data rates than the basic LTE andwhich is also standardized under the control of 3GPP.

As the 5G system will be based on LTE or LTE-A, respectively, it isassumed that specific requirements of the 5G technologies and, thus, ofembodiments described herein, will, basically, be dealt with by featuresand methods which are already defined in the LTE and LTE-A standarddocumentation.

As discussed, in 3GPP a work Item (WI) on New Radio Access Technology(NR) has been agreed and the new Radio Access Technology (RAT) isexpected to operate in a large range of frequencies, from hundreds ofMHz to 100 GHz and it is expected to cover a broad range of use cases,examples of which are given in the outset.

At least for initial deployment, NR and LTE are expected to coexist, asis also illustrated in FIG. 1. FIG. 1 illustrates an embodiment of aRadio Access Network RAN 1, which has a macro cell 2, which isestablished by a LTE (base station) eNodeB 3. Moreover, in the macrocell 2, a NR cell 4 is located, which is established by a NR (basestation) eNodeB 5 (the NR eNodeB may also be referred to as NR gNB or NRgNodeB).

A (user equipment) UE 6 can communicate with the LTE eNodeB 3 and, aslong it is within the NR cell 4, it can also communicate with the NReNodeB 5.

The coexistence of the NR and LTE may be implemented in someembodiments, by using the same frequency resources for NR and LTE, butNR and LTE are differentiated using TDM (Time Division Multiplexing),e.g. NR uses LTE MBSFN (Multicast-Broadcast Single Frequency) subframes,as illustrated in FIG. 2.

FIG. 2 illustrates an example, where there are up to a maximum of sixLTE MBSFN subframes in a radio frame. Here, exemplary, six LTE MBSFNsubframes, i.e. subframes 1, 2, 3, 6, 7, 8, are used for NRtransmissions and the remaining subframes are used for LTEtransmissions.

Another implementation, which may be used in some embodiments asillustrated in FIG. 3, is to use separate frequency resources andimplement NR as a secondary carrier in a multi-carrier operation, i.e.LTE uses one frequency carrier (lower box in FIG. 3) and NR uses anotherfrequency carrier (upper box in FIG. 3).

One of the common deployment will be, in some embodiments, where LTEwill use FDD (Frequency Division Duplexing) mode of operation and NRdeploys TDD (Time Division Duplexing) mode of operation.

Such coexistence in certain frequency bands may result in twosimultaneous peaks, in some embodiments, generated by the UE on uplinkif simultaneous uplink in LTE and NR is configured and used.

Such peaks may generate intermodulation products, which will interferethe receiver in the UE and, in a case where, where for example, LTEdeploys FDD and NR deploys TDD, the LTE downlink (DL) performance mightbe impacted.

Generally, the problem may be severe, in some embodiments, if LTE isimpacted because intermediate frequencies are already standardized andany interference will be detrimental to the LTE performance.

However, as NR is a new system under design, it offers designflexibility and design of intermediate frequencies may take anyinterference from existing LTE bands into account in some embodiments.Hence, some embodiments address a scenario, where LTE deploys FDD and NRdeploys TDD in the coexistence situation.

In some embodiments, for very specific frequency allocations withinLTE−NR band combinations, reference sensitivity power level degradationmay be experienced due to intermodulation distortion issues when a dualUL transmission is used by the user equipment.

According to 3GPP document RP-172085 (“Signalling for Single/Dual UL Tx(current status)”, RAN 2 status Report to Ran#77), a UE capabilityindicates that the UE is not allowed to have two simultaneous ULtransmissions (i.e. dual NR and LTE transmission in the UL) for the RAN4specified channel allocations in a given band combination. In such acase, only one uplink transmission will be activated accordingly.RAN1#89 (May) agreed that 5G NR needs to support non-standalone (NSA) NRUEs, which may not be capable of transmitting on two uplinks at the sametime when they are in a LTE−NR Dual Connectivity (DC) configuration.

Thus, it has been recognized that there is a need to support for singleTx (transmission) UEs for LTE−NR DC.

At RAN2#98 in Hangzhou, the UE overheating problem was discussed for LTEand the following agreements were made (see also 3GPP documentR2-1708219, TSG-RAN WG2#99, 21^(st) to 25^(th) August 2017, Berlin,“Report of email discussion [98#43] [LTE/TEI14] UE overheating problem):

1: To alleviate the UE's overheating problem, a specification basedsolution for eNB to reconfigure e.g. reduced number of activatedcomponent carriers, reduced MIMO layer capability, reduced modulationorder of the UE is supported.

2: It is not considered to specify Option 1 (temperature report) as asolution to address UE overheating problem.

3. The solution will be based on option 3. (Report UE temporarycategory/capability) or option 4 (Assistance information for parameterre-configuration) or some combination. This does not exclude anindication to the eNB that the cause is due to overheating.

It has been recognized that for NR higher data rates, multi-beamoperation etc. are to be specified, in some embodiments, which mightlead to even more overheating problems.

It has been further recognized that the UE has the best understanding ofits overheat situation, and since different UE's/manufacturer/brandshave different hardware constructions and different heat sensitivities,and my perform temperature measurements potentially in different ways,it seems preferably, at least in some embodiments, to let the UE controlthe heat regulation.

Generally, different UEs may have different hardware configurations and,thus, may have different locations of temperature sensors in someembodiments.

Hence, unless a specific definition of the temperature measurement in aUE would be standardized, it has been recognized that a UE indication ofa temperature would be an undefined value to report. Therefore,specifying such temperature measurement in a UE would likely bechallenging.

For LTE it has been agreed that option 3, mentioned above, (“Report UEtemporary category/capability”) or option 4 (“Assistance information forparameter re-configuration”) or some combination thereof will be used,and, generally, this might be a way to temporarily indicate a change incapability, in some embodiments.

It has also been agreed for NR (New Radio) to include temporarycapability change indication or reporting.

Furthermore in a RAN2#99 meeting it has been agreed (see also 3GPPTSG-RAN WG2 Meeting #99, Berlin, Germany, Aug. 21-25, 2017, RAN2Chairman (Intel), Chairman notes, in particular sections 8.2.5 and10.2.6):

For LTE:

1: Explicit indication of UE's overheating status is not supported. Thisindication is implicitly carried by UE's overheating report signalling.

2: Some reference to the overheating issue will be including in the CRsadding this feature.

3: UEAssistancelnformation is used to carry the request from the UE

4: UE's request is triggered by internal overheating caused by forexample, the advanced CA, the higher order MIMO, the higher ordermodulation scheme being concurrently configured. This trigger will bedescribed in the spec (FFS whether it is in stage 2 or stage 3 anddetailed wording).

5: The prohibit timer in RRC is used to avoid UE's frequent requests.

6: RRCConnectionReconfiguration is used to indicate that the network cansupport the feature. If the network does not indicate support of thefeature, the UE shall not send any request.

7: A ‘reject’ message from the network (in response to the request) isnot supported.

And it is agreed that the UE provides a reduced UE category in therequest.

For New Radio the following agreements are made:

In NR, the number of supported MIMO layers is signalled as explicit UEcapability and not part of a UE category.

In NR, the modulation schemes are signaled as explicit UE capability andnot part of a UE category.

RAN2 assumes that the UE's band combinations together with the basebandcapabilities (modulation scheme, MIMO layers, . . . ) comprise allinformation necessary to calculate the maximum data rate achievable oneach serving cell, in each cell group and per UE.

If RAN1 and RAN4 agree with that assumption, RAN2 intends to apply thefollowing:

“A non-DC UE supporting a peak data rate that is lower than the datarate achievable according to the above-mentioned parameters indicatesthis by a per-UE category (data rate).

However, a UE supporting dual connectivity (MR−DC, NR−NR DC) shall notadvertise a category (data rate) that is lower than the highest datarate achievable according to any of the DC band combinations (to avoidthe need for inter-node negotiation of the data rate split).”

Based on the foregoing, there is a debate ongoing whether the UE shouldindicate not only its maximum UE capability for each RAT (Radio AccessTechnology), but also if there are some maximum limitations when forEN-DC (LTE−NR Dual-Connectivity) the capabilities are aggregated.

Thus, it has been recognized that there is need for a UE to indicatemore dynamically that it has problems with certain configurations, e.g.for certain band combinations when configured for simultaneous (dual)uplink transmission (LTE+NR).

As discussed, in some scenarios an overheat situation may occur, whenthe UE is configured with Dual Uplink transmission LTE+NR, as mentionedabove, and as also illustrated in FIG. 3.

Hence, it has been recognized that, in some embodiments, for solving theUE overheat issue with capability degradation, some indication could beused to indicate that it is the Dual UL Tx usage that is the cause foroverheating in general.

Consequently, some embodiments pertain to a user equipment for a mobiletelecommunications system including circuitry configured to communicatewith a new radio base station and a LTE base station, wherein thecircuitry is further configured to perform simultaneous uplinkcommunication with the LTE base station and the new radio base station;detect an overheating situation; and transmit capability information inresponse to detecting the overheating situation.

Generally, the LTE base station may be based on the principles of LTE(LTE-A) and the new radio (NR) base station may be based on NR RAT, asalso discussed above. The LTE base station may be based on the knowneNodeB of LTE, as one example, and the NR base station may be based onthe discussed NR eNodeB. The user equipment may be, for example, amobile phone, smartphone, a computer, tablet, tablet personal computer,or the like, including a mobile communication interface, or any otherdevice which is able to perform a mobile telecommunication via, forexample, LTE and NR, such as a hot spot device with a mobilecommunication interface, etc. Hence, in some embodiments, the userequipment is configured to perform communication with the NR basestation and the LTE base station simultaneously, such that theabove-discussed coexistence issue may occur in some embodiments.

The overheating situation may be detected based on a predefinedcombination of a new radio uplink band and a LTE uplink band. Asdiscussed above, some of the combinations of the new radio uplink bandand the LTE uplink band may be problematic, since a double peaksituation may occur which may result in overheating of the receiver.Such band combinations may be known in advance, and, thus, predefined,such that the overheating situation can be determined, if such aproblematic band combination is used.

The overheating situation may also be detected based on a decodingerror. For instance, an LTE PDCCH (Physical Downlink Control Channel)may not be decoded and, thus, a decoding error may occur. Based on thedecoding error, it may be derived that an overheating situation causesthe decoding error, such that thereby the overheating situation can bedetected.

The overheating situation may be detected based on a signal strength ofa reference signal. For instance, UE calculates the pathloss between thebase station and the UE based on RSRP (Reference Signal Receiver Power)of the reference signal with base station Tx power. UE estimates theoverheat problem or detects that an overheating situation may cause thepathloss, if the calculated pathloss may be lower than a predefinedthreshold value.

The overheating situation may be detected based on a temperaturemeasurement of a receiver of the circuitry. As mentioned, the doublepeak situation may cause an overheating of the receiver of the userequipment which may be detected, based on a temperature measurement.

Furthermore, the overheating situation may be detected based on thesimultaneous uplink communication with the LTE base station and the newradio base station, since the simultaneous uplink communication maycause overheating. Furthermore, it may be detected in advance that anoverheating situation may occur when an dual uplink transmission isinitiated. Hence, in some embodiments, the overheating situation may becorrelated with the ongoing simultaneous uplink communication with theLTE base station and the new radio base station, which also may causeoverheating of the transmitter (in some embodiments receiver andtransmitter are implemented as a transceiver unit such that also heatingof the transmitter may cause problems of the receiver and/or atransmitter and receiver circuitry may be close to each other).

The overheating situation may be detected based on history informationindicating a previous overheating situation. For instance, for apredefined uplink NR/LTE band combination it is known from the past thatoverheating occurred. Such history information can be used for detectingthat an overheating situation may be present.

In some embodiments, the capability information is transmitted based onan assistance information signaling procedure, which is also known fromLTE.

The capability information may indicate the overheating situation. Forinstance, an information element or a bit may be provided, for example,in an assistance information message, indicating that an overheatingsituation is present.

Hence, the indication of the overheating situation may be used toindicate when the UE is configured for Dual uplink Tx, causingintermodulation products interfering with the UE LTE receiver forcertain band combinations. Moreover, the indication of the overheatingsituation may indicate that the current Dual uplink Tx configuration isthe cause for overheating, or that certain band combination causingintermodulation products interfering with the UE LTE receiver, asdiscussed. In some embodiments, the indication of the overheatingsituation included in the capability information may be transmitted inat least one of the following situations: detection of a realoverheating (e.g. based on a temperature measurement), and in the casethat a problematic band combination is used for a dual uplinktransmission.

The capability information may indicate a combination of a new radiouplink band and a LTE uplink band, which may be problematic, asdiscussed, and the network (e.g. LTE and/or NR eNodeB) may reconfigurethe uplink transmission of the user equipment.

The capability information may indicate a capability of the userequipment, based on the detected overheating situation. Hence, thecircuitry may decide that the current capability setting results in theoverheating situation and may solve this by transmitting correspondingnew or temporal capability information, which may include at least oneof the following: normal setting; single tx (separate LTE and NR UplinkTx band); UL sharing TDM based (same frequency band); No NR support atall for UE UL tx; No NR support at all (including DL as well);Problematic band combination; Simultaneous Uplink Tx (including LTE Bandand NR Band).

Some embodiments pertain to a base station for a mobiletelecommunications system including circuitry configured to communicatewith at least one user equipment, wherein the circuitry is furtherconfigured to receive capability information from the eat least one userequipment, wherein the capability information is transmitted by the userequipment based on a detected overheating situation, as also discussed.The base station may be a new radio base station or a LTE base station,as discussed herein.

The base station circuitry may be further configured to adjust an uplinkconfiguration for the at least one user equipment, based on the receivedcapability information. The adjustment of the uplink configuration mayinclude at least one of the following: Single tx (separate LTE and NRUplink Tx band); UL sharing TDM based (single tx, same frequency band);No NR support at all for UE UL tx; No NR support at all (including DL aswell).

Returning to FIG. 4, there is illustrated an embodiment of a mobiletelecommunications method 20 which can be performed by the UE (e.g. UE 6of FIG. 1) and the LTE and/or NR base station (e.g. LTE eNodeB 3 and NReNodeB 5, FIG. 1).

As mentioned, in some embodiments, it is only the UE who has the abilityto detect the co-existence problem due to intermodulation issues. Thenetwork does not know whether a UE is experiencing performancedegradation due to LTE−NR co-existence or not. Hence, in this embodimentthe network (e.g. NR/LTE eNodeB) gets knowledge about the co-existenceproblem, since the UE sends a capability information which may includean indication of an overheating situation, which may be based on aco-existence situation, (which may be interpreted by the network as aco-existence indication) to network once the overheating situationoccurs.

At 21, the UE detects an overheating situation. This detection may bebased on several triggers.

For example, the UE experiences a downlink (LTE or NR) performancedegradation on a problematic band combination or multiple problematicband combinations. This can be detected, e.g., since the UE cannotdecode the LTE PDCCH correctly (decoding error), or since the RSRP onthe reference signal is below a certain threshold. Moreover, the UE canadditionally correlate this sudden decrease in radio conditions on thedownlink with a simultaneous uplink transmission timing.

Alternatively (or additionally), the UE detects the overheatingsituation based on overheat problems, e.g. based on temperaturemeasurements, based on problematic uplink band combination, etc., andthis problem can be correlated with a simultaneous dual uplinktransmission.

In some embodiments, also a combination of the above alternatives isimplemented for detecting the overheating situation at 21, e.g. bydetecting that the overheat situation occurs only for certain bandcombinations when dual uplink transmission is configured.

Alternatively, the UE does not experience any overheating issue butdetects an overheating situation at 21, since it knows from previousexperience, e.g. from previous overheating issues for problematic bandcombinations that overheating might occur.

As mentioned, when at least one of the trigger(s) mentioned above istriggered, i.e. the UE has detected an overheat situation at 21, asdiscussed above, the UE transmits, at 22, capability information to thenetwork (e.g. NR and/or LTE base station).

The capability information may include an indication of the overheatingsituation, e.g. the problematic band combination on which UE isexperiencing performance degradation by the simultaneous ULtransmissions. Moreover, the capability information may also includeinformation about a new (temporal) reduced capability of the UE.

As will be discussed further below, the capability information may betransmitted in a temporary UE capability signaling.

The network, e.g. NR and/or LTE eNodeB receives the capabilityinformation at 23.

After receiving this information, the network will adjust at 24 the LTEand/or NR UL configuration to at least one of the following:

-   -   Single tx (separate LTE and NR Uplink Tx band)    -   UL sharing TDM based (single tx, same frequency band)    -   No NR support at all for UE UL tx    -   No NR support at all (including DL as well)

Since the UE capability is exchanged at the time of attach or downloadedfrom the MME (Mobile Management Entity), the traditional UE capabilityframework does not offer flexibility to dynamically signal its overheatand/or IM interference situation, in some embodiments, and, thus, insome embodiments, a temporary capability information exchange procedureis used.

In some embodiments, this temporary UE capability procedure isstandardized for the cases where, e.g., overheating takes place in theUE in LTE.

In some embodiments, for NR a temporary capability degradation signalingmight be used, which uses the assistance information procedure, forindicating an overheat situation.

Hence, in some embodiments the assistance information may include the(new, or degraded, temporal) capability information and, it mayadditionally include the indication of the overheating situation, suchas the problematic band combination.

In some embodiments, the enhanced signaling is performed in accordancewith a signaling procedure 30, as also illustrated in FIG. 5.

This procedure 30, the basic principle of which is also, generally,known from 3GPP TS 36.331 (see, for example, 3GPP TS 36.331 V14.4.0(2017-09), 3rd Generation Partnership Project; Technical

Specification Group Radio Access Network; Evolved Universal TerrestrialRadio Access (E-UTRA); Radio Resource Control (RRC); Protocolspecification, (Release 14)), is updated in some embodiments to support,simultaneous uplink transmission timing assistance information due tooverheating and/or due to experienced IM interference, when using Dualuplink Tx, as discussed.

A UE capable of providing assistance information in RRC_CONNECTED, whereat 31 RRC connection reconfiguration message is transmitted, mayinitiate the procedure, if it has been configured to providesimultaneous uplink assistance information at 32, upon detecting anoverheating situation, such as an IM interference, or internaloverheating caused by simultaneous dual uplink transmission, asdiscussed above. Hence, the UE assistance information may be used fortransmission of the capability information.

The UE Assistance Information (including the capability information)includes the following additional information (partially or fully): thesimultaneous uplink assistance information, which includes informationabout at least one of the following capabilities:

normal;

Single tx (separate LTE and NR Uplink Tx band);

UL sharing TDM based (same frequency band);

No NR support at all for UE UL tx;

No NR support at all (including DL as well);

Problematic band combination

-   -   SimultaneousUplinkTx (LTE Band and/or NR Band)

As discussed above, the network, e.g. the NR eNodeB (or LTE eNodeB) willuse the capability information transmitted in the assistance informationfor adjusting the uplink transmission.

Hence, summarizing, in some embodiments, the UE informs the base stationthat the current Dual Uplink Tx configuration is causing an overheatproblem, as discussed above.

In some other embodiments, the UE indicates that a certain bandcombination is causing co-existence problems based on intermodulationproducts from the simultaneous uplink transmission, as discussed above.

In yet other embodiments, the UE may change a band combination listbetween two subsequent updates of the UE capability, wherein the abovediscussed capability signaling may be performed. For example, if the UEindicated an overheating problem which existed for bands A, B, C andthen due to IM interference issue, an overheating occurs or may occur inthe future, then the UE may change the capability signaling accordingly.

In the following, an embodiment of a general purpose computer 130 isdescribed under reference of FIG. 6. The computer 130 can be implementedsuch that it can basically function as any type of base station or newradio base station, transmission and reception point, or user equipmentas described herein. The computer has components 131 to 140, which canform a circuitry, such as any one of the circuitries of the basestations, and user equipments, as described herein.

Embodiments which use software, firmware, programs or the like forperforming the methods as described herein can be installed on computer130, which is then configured to be suitable for the concreteembodiment.

The computer 130 has a CPU 131 (Central Processing Unit), which canexecute various types of procedures and methods as described herein, forexample, in accordance with programs stored in a read-only memory (ROM)132, stored in a storage 137 and loaded into a random access memory(RAM) 133, stored on a medium 140 which can be inserted in a respectivedrive 139, etc.

The CPU 131, the ROM 132 and the RAM 133 are connected with a bus 141,which in turn is connected to an input/output interface 134. The numberof CPUs, memories and storages is only exemplary, and the skilled personwill appreciate that the computer 130 can be adapted and configuredaccordingly for meeting specific requirements which arise, when itfunctions as a base station, and user equipment.

At the input/output interface 134 several components are connected: aninput 135, an output 136, the storage 137, a communication interface 138and the drive 139, into which a medium 140 (compact disc, digital videodisc, compact flash memory, or the like) can be inserted.

The input 135 can be a pointer device (mouse, graphic table, or thelike), a keyboard, a microphone, a camera, a touchscreen, etc.

The output 136 can have a display (liquid crystal display, cathode raytube display, light emittance diode display, etc.), loudspeakers, etc.

The storage 137 can have a hard disk, a solid state drive and the like.

The communication interface 138 can be adapted to communicate, forexample, via a local area network (LAN), wireless local area network(WLAN), mobile telecommunications system (GSM, UMTS, LTE, NR etc.),Bluetooth, infrared, etc.

It should be noted that the description above only pertains to anexample configuration of computer 130. Alternative configurations may beimplemented with additional or other sensors, storage devices,interfaces or the like. For example, the communication interface 138 maysupport other radio access technologies than the mentioned UMTS, LTE andNR.

When the computer 130 functions as a base station, the communicationinterface 138 can further have a respective air interface (providinge.g. E-UTRA protocols OFDMA (downlink) and SC-FDMA (uplink)) and networkinterfaces (implementing for example protocols such as S1-AP, GTP-U,SI-MME, X2-AP, or the like). Moreover, the computer 130 may have one ormore antennas and/or an antenna array. The present disclosure is notlimited to any particularities of such protocols.

It should be recognized that the embodiments describe methods with anexemplary ordering of method steps. The specific ordering of methodsteps is however given for illustrative purposes only and should not beconstrued as binding.

The methods as described herein are also implemented in some embodimentsas a computer program causing a computer and/or a processor and/orcircuitry to perform the method, when being carried out on the computerand/or processor and/or circuitry. In some embodiments, also anon-transitory computer-readable recording medium is provided thatstores therein a computer program product, which, when executed by aprocessor/circuitry, such as the processor/circuitry described above,causes the methods described herein to be performed.

All units and entities described in this specification and claimed inthe appended claims can, if not stated otherwise, be implemented asintegrated circuit logic, for example on a chip, and functionalityprovided by such units and entities can, if not stated otherwise, beimplemented by software.

In so far as the embodiments of the disclosure described above areimplemented, at least in part, using software-controlled data processingapparatus, it will be appreciated that a computer program providing suchsoftware control and a transmission, storage or other medium by whichsuch a computer program is provided are envisaged as aspects of thepresent disclosure.

Note that the present technology can also be configured as describedbelow.

(1) A user equipment for a mobile telecommunications system includingcircuitry configured to communicate with a new radio base station and aLTE base station, wherein the circuitry is further configured to:

-   -   perform simultaneous uplink communication with the LTE base        station and the new radio base station;    -   detect an overheating situation; and transmit capability        information in response to detecting the overheating situation.

(2) The user equipment of (1), wherein the overheating situation isdetected based on a predefined combination of a new radio uplink bandand a LTE uplink band.

(3) The user equipment of (1) or (2), wherein the overheating situationis detected based on a decoding error.

(4) The user equipment of anyone of (1) to (3), wherein the overheatingsituation is detected based on a signal strength of a reference signal.

(5) The user equipment of anyone of (1) to (4), wherein the overheatingsituation is detected based on a temperature measurement of a receiverof the circuitry.

(6) The user equipment of anyone of (1) to (5), wherein the overheatingsituation is detected based on the simultaneous uplink communicationwith the LTE base station and the new radio base station.

(7) The user equipment of anyone of (1) to (6), wherein the overheatingsituation is detected based on history information indicating a previousoverheating situation.

(8) The user equipment of anyone of (1) to (7), wherein the capabilityinformation is transmitted based on an assistance information signalingprocedure.

(9) The user equipment of anyone of (1) to (8), wherein the capabilityinformation indicates the overheating situation.

(10) The user equipment of (9), wherein the capability informationindicates a combination of a new radio uplink band and a LTE uplinkband.

(11) The user equipment of anyone of (1) to (10), wherein the capabilityinformation indicates a capability of the user equipment, based on thedetected overheating situation.

(12) A base station for a mobile telecommunications system comprisingcircuitry configured to communicate with at least one user equipment,wherein the circuitry is further configured to:

-   -   receive capability information from the eat least one user        equipment, wherein the capability information is transmitted by        the user equipment based on a detected overheating situation.

(13) The base station of (12), wherein the circuitry is furtherconfigured to adjust an uplink configuration for the at least one userequipment, based on the received capability information.

1. A user equipment for a mobile telecommunications system comprisingcircuitry configured to communicate with a new radio base station and aLTE base station, wherein the circuitry is further configured to:perform simultaneous uplink communication with the LTE base station andthe new radio base station; detect an overheating situation; andtransmit capability information in response to detecting the overheatingsituation.
 2. The user equipment of claim 1, wherein the overheatingsituation is detected based on a predefined combination of a new radiouplink band and a LTE uplink band.
 3. The user equipment of claim 1,wherein the overheating situation is detected based on a decoding error.4. The user equipment of claim 1, wherein the overheating situation isdetected based on a signal strength of a reference signal.
 5. The userequipment of claim 1, wherein the overheating situation is detectedbased on a temperature measurement of a receiver of the circuitry. 6.The user equipment of claim 1, wherein the overheating situation isdetected based on the simultaneous uplink communication with the LTEbase station and the new radio base station.
 7. The user equipment ofclaim 1, wherein the overheating situation is detected based on historyinformation indicating a previous overheating situation.
 8. The userequipment of claim 1, wherein the capability information is transmittedbased on an assistance information signaling procedure.
 9. The userequipment of claim 1, wherein the capability information indicates theoverheating situation.
 10. The user equipment of claim 9, wherein thecapability information indicates a combination of a new radio uplinkband and a LTE uplink band.
 11. The user equipment of claim 1, whereinthe capability information indicates a capability of the user equipment,based on the detected overheating situation.
 12. A base station for amobile telecommunications system comprising circuitry configured tocommunicate with at least one user equipment, wherein the circuitry isfurther configured to: receive capability information from the eat leastone user equipment, wherein the capability information is transmitted bythe user equipment based on a detected overheating situation.
 13. Thebase station of claim 12, wherein the circuitry is further configured toadjust an uplink configuration for the at least one user equipment,based on the received capability information.